| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling device with a long life in which the rolling body is hardly damaged even though it is used under the corrosive environment where a metal material can not be used and under the high load environment where a great load acts. SOLUTION: An inner ring 1, an outer ring 2, and a ball 3 of a deep groove ball bearing are made of alumina made by pressure sintering. Further, the crushing load of the ball 3 is Wc or more shown by the following equation. Wc=0.05×Da<SP>1.93</SP>, wherein the unit of the Wc is kN, Da is the diameter of the ball, and the unit of the same is mm. COPYRIGHT: (C)2005,JPO&NCIPI
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